133428979 has 4 divisors (see below), whose sum is σ = 134750160. Its totient is φ = 132107800.

The previous prime is 133428949. The next prime is 133428983. The reversal of 133428979 is 979824331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 979824331 = 101 ⋅9701231.

It is a cyclic number.

It is not a de Polignac number, because 133428979 - 2⁷ = 133428851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (133428949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 660439 + ... + 660640.

It is an arithmetic number, because the mean of its divisors is an integer number (33687540).

Almost surely, 2^133428979 is an apocalyptic number.

133428979 is a deficient number, since it is larger than the sum of its proper divisors (1321181).

133428979 is a wasteful number, since it uses less digits than its factorization.

133428979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1321180.

The product of its digits is 326592, while the sum is 46.

The square root of 133428979 is about 11551.1462201809. The cubic root of 133428979 is about 510.9950826921.

The spelling of 133428979 in words is "one hundred thirty-three million, four hundred twenty-eight thousand, nine hundred seventy-nine".